(1) A collection of tables and views that contains descriptions of objects such as tables, views, and indexes.
(2) A directory of files and libraries, with reference to their locations.
(3) A data set that contains information about other data sets.
(4) A container that, depending on the container type, holds processes, data, resources, organizations, or reports in the project tree.
(5) To enter information about a data set or a library into a catalog.